Why are my girlfriend's thighs so jiggly, despite she herself being so slim?

Anonymous
So my girlfriend is not fat in the least bit. She's super slim, and super fit. Yet her thighs... they just jiggle so much, even when she only moves her legs very slightly... like if she's just sitting there fidgeting her legs, her thighs jiggle.

To give an idea of her body type, here's a photo of a woman I found with almost the exact same proportions and body type as her.
Why are my girlfriend's thighs so jiggly, despite she herself being so slim?
She's that slim. Flat stomach and everything. Yet her thighs just jiggle away.

Not that it's a bad thing. It's kind of nice, since her thighs are extra squishy and fleshy! But I'm just curious as to how someone so slim could have such jiggly thighs.

Also, outside of school, she pretty much always wears shorts, so I can see her bare thighs jiggling very clearly.
Why are my girlfriend's thighs so jiggly, despite she herself being so slim?
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